Legend:

And next to the wordpress.org repository: Everybody can install add-ons (plugins/themes) on theirs with a different licensing. With those as with the parts of the wordpress code that are distributed under GPL but on their own license (for example TinyMCE), it should be made visible that those parts exist and which their authors and terms are, so a user can really learn about her/his rights.

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'''Edit:''' TinyMCE is probably not the best example, but I think you get the idea.